Frequencies for first 10,000 rows of gestat10 variable in natlterr1998 dataset :

  Gestation |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         67        0.67        0.67
          3 |        135        1.35        2.02
          4 |        582        5.82        7.84
          5 |        514        5.14       12.98
          6 |      5,548       55.48       68.46
          7 |      2,062       20.62       89.08
          8 |        780        7.80       96.88
          9 |        302        3.02       99.90
         10 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015